P1299 on Ford
Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)
P1299 on Ford vehicles indicates cylinder head over-temperature protection active (manufacturer-specific, ford). Au7o has documented this code across 1 Ford model — most commonly on Mustang. P1299 is a manufacturer-specific powertrain code, most commonly on Ford, indicating that the Cylinder Head Temperature (CHT) sensor detected an engine overheating condition and the computer has activated a fail-safe cooling strategy to protect the engine. The PCM may reduce power and shut off fuel to some cylinders to limit heat, often putting the vehicle in a limited 'limp' mode. This means the engine is running too hot and continued driving risks serious engine damage, so the vehicle should be stopped and cooled as soon as it is safe. Typical repair costs on Ford range from $250 to $700, depending on the specific model and root cause.
Common Causes of P1299
- •Low coolant level or coolant loss/leak
- •Stuck-closed thermostat
- •Failed water pump
- •Cooling fan not operating
- •Faulty cylinder head temperature (CHT) sensor
- •Blocked radiator or restricted coolant flow
- •Head gasket failure or air in the cooling system
P1299 on Ford by Model
Ford Mustang(1 issue)
- 4.0L Cologne V6 Thermostat Housing Cracking and Coolant Leaks2005-2010
The 4.0L SOHC V6 used in 2005-2010 Mustangs commonly develops coolant leaks from the composite thermostat housing and related seals. The plastic housing can warp or crack with age and heat cycling, causing external coolant seepage and sometimes overheating if the leak worsens. This is a well-known issue across Ford applications using the same 4.0L engine and is frequently documented in owner forums and repair databases.
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View P1299 across all makes →Frequently Asked Questions
What does P1299 mean on Ford?▼
P1299 stands for "Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)." P1299 is a manufacturer-specific powertrain code, most commonly on Ford, indicating that the Cylinder Head Temperature (CHT) sensor detected an engine overheating condition and the computer has activated a fail-safe cooling strategy to protect the engine. The PCM may reduce power and shut off fuel to some cylinders to limit heat, often putting the vehicle in a limited 'limp' mode. This means the engine is running too hot and continued driving risks serious engine damage, so the vehicle should be stopped and cooled as soon as it is safe. On Ford specifically, this code is documented across 1 model.
What causes P1299 on Ford vehicles?▼
Common causes on Ford: Low coolant level or coolant loss/leak, Stuck-closed thermostat, Failed water pump, Cooling fan not operating, Faulty cylinder head temperature (CHT) sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1299 on a Ford?▼
Repair costs on Ford range from $250 to $700, depending on the specific model and root cause.
Which Ford models have P1299 documented?▼
Au7o has documented P1299 on 1 Ford model: Mustang.